封装Modbus串口通讯之SerialPort类

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Data;
 4 using System.IO.Ports;
 5 using System.Linq;
 6 using System.Text;
 7 using System.Threading.Tasks;
 8 using System.Windows.Interop;
 9 using System.Windows.Markup;
10 using System.Windows.Threading;
11 
12 namespace Test
13 {
14     public class EleCommandHelper
15 
16     {
17         private SerialPort serialPort;
18         private const Parity DefaultParity = Parity.None;
19         private const int DefaultDataBits = 8;
20         private const StopBits DefaultStopBits = StopBits.One;
21 
22         public bool IsOrNotOpen()
23         {
24             return serialPort.IsOpen;
25         }
26         public void Close()
27         {
28             if (serialPort.IsOpen == true)
29             {
30                 serialPort.Close();
31             }
32         }
33 
34 //实例化该类,需要填两个参数,一个波特率,一个串口名字
35         public EleCommandHelper(string portName, int baudRate)
36         {
37             serialPort = new SerialPort(portName, baudRate, DefaultParity, DefaultDataBits, DefaultStopBits);
38             //serialPort.DataReceived += SerialPort_DataReceived;
39             serialPort.Open();
40             
41 
42         }
43 
44 //通用 带返回值
45         public string GetSendModbus(string hexCommand)
46         {
47 
48             byte[] commandBytes = HexStringToByteArray(hexCommand);
49 
50             serialPort.Write(commandBytes, 0, commandBytes.Length);
51             // 等待响应
52             System.Threading.Thread.Sleep(500);
53 
54             byte[] responseBytes = new byte[serialPort.BytesToRead];
55             serialPort.Read(responseBytes, 0, responseBytes.Length);
56 
57             string responseHex = BitConverter.ToString(responseBytes).Replace("-", " ").ToUpper().Trim();
58 
59             return responseHex;
60         }
61 
62  private byte[] HexStringToByteArray(string hexString)
63         {
64             hexString = hexString.Replace(" ", "").Replace("-", "").ToUpper().Trim();
65             int bytesCount = hexString.Length / 2;
66             byte[] bytes = new byte[bytesCount];
67 
68             for (int i = 0; i < bytesCount; i++)
69             {
70                 string byteString = hexString.Substring(i * 2, 2);
71                 bytes[i] = Convert.ToByte(byteString, 16);
72             }
73 
74             return bytes;
75         }
76     }
77 }